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Title: Predicting the Solubility of Inorganic Ion Pairs in Water

Journal Article · · Angewandte Chemie (International Edition)
 [1];  [2];  [2];  [3];  [3];  [4];  [4];  [5]; ORCiD logo [3]
  1. Oregon State University, Corvallis, OR (United States); OSTI
  2. Barcelona Institute of Science & Technology (BIST), Tarragona (Spain)
  3. Oregon State University, Corvallis, OR (United States)
  4. Umea University (Sweden)
  5. Barcelona Institute of Science & Technology (BIST), Tarragona (Spain); Universitat Rovira i Virgili (URV), Tarragona (Spain)

Polyoxometalates (POMs), ranging in size from 1 to 10’s of nanometers, resemble building blocks of inorganic materials. Elucidating their complex solubility behavior with alkali-counterions can inform natural and synthetic aqueous processes. Here in the study of POMs ([Nb24O72H9]15-, Nb24) we discovered an unusual solubility trend (termed anomalous solubility) of alkali-POMs, in which Nb24 is most soluble with the smallest (Li+) and largest (Rb/Cs+) alkalis, and least soluble with Na/K+. Via computation, we define a descriptor (σ-profile) and use an artificial neural network (ANN) to predict all three described alkali-anion solubility trends: amphoteric, normal (Li+>Na+>K+>Rb+>Cs+), and anomalous (Cs+>Rb+>K+>Na+>Li+). Testing predicted amphoteric solubility affirmed the accuracy of the descriptor, provided solution-phase snapshots of alkali–POM interactions, yielded a new POM formulated [Ti6Nb14O54]14-, and provides guidelines to exploit alkali–POM interactions for new POMs discovery.

Research Organization:
Oregon State University, Corvallis, OR (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); Spanish Ministry of Science and Innovation; Severo Ochoa Excellence Accreditation; Catalan Institute of Chemical Research (ICIQ); Murdock Charitable Trust; Swedish Research Council; Kempe Foundation
Grant/Contract Number:
SC0010802
OSTI ID:
1976280
Alternate ID(s):
OSTI ID: 1846505
Journal Information:
Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 19 Vol. 61; ISSN 1433-7851
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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